Schmähling, J and Hamprecht, F A (2007). Generalizing the Abbott-Firestone curve by two new surface descriptors. Wear. 262 1360-1371

 Schmähling,  (2006). Statistical characterization of technical surface microstructure. University of Heidelberg

 Schmähling, J, Hamprecht, F A and Hoffmann, D M P (2006). A three-dimensional measure of surface roughness based on mathematical morphology. International Journal of Machine Tools and Manufacture. 46 (14) 1764-1769